Tank-joint and process of making same.



m. 669,? Patented Mar. 5, I90l.

w. s. JUDD.

TANK .JOINT AND PROCESS OF MAKING SAME.

(Application filed Dec. 11, 1900.1

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WALLACE S. JUDD, OF CLEVELAND, OHIO, ASSIGNOR TO THE AVERY STAMPINGCOMPANY, OF SAME PLACE.

TANK-JOINT AND PROCESS OF MAKING SAME.

SPECIFICATION formingpart of Letters Patent N 0. 669,117, dated March 5,1901.

Application filed December 11, 1900. Serial No. 39,462. (No model.)

To aZZ whom it may concern:

Be it known that I, I/VALLAOE S. JUDD, a citizen of the United States,residing at Cleveland, in the county of Ouyahoga and State of Ohio, haveinvented a certain new and useful Improvement in Tank-Joints andProcesses of Making the Same, of which the following is a full, clear,and exact description, reference being bad to the accompanying drawings.

The invention relates to metal tanks; and the object is to provide acheap strong metal tank adapted for use as a hot-water boiler or forother purposes where a strong water-tight tank is required.

The invention relates to the joint of two parts of the tank; and itconsistsin that tankjoint which is hereinafter described and in thedescribed process of making the same, as set forth definitely in theclaims.

In the drawings, Figure 1 is a central vertical sectional view of a tankend constructed in accordance with my invention, and Fig. 2 is anenlarged sectional view through one side of said end.

Referring to the parts by letters, A represents the tank-body,cylindrical in form. B represents another portion of the tank, which maybe a cap. It has a cylindrical marginal flange b for closing one end ofsaid body. The end of the body and this cylindrical flange are adaptedto telescope the one within the other and are of such diametersrelatively that they fit one another tightly. In one of said overlappingparts (in the present case the end of the body) a plurality of smallholes a are formed.

In the embodiment of the invention shown the cap-flange is outside ofthe body and the holes are in the inner one of said two overlappingparts. These, however, are details which may be varied as desired. Theholes a, as shown, are only formed in one of said members; but theymight be formed in both, provided the holes do not overlap, the holes inthe outer member being, as indicated by the dotted lines, at a in Fig.2. The drawings show What I regard to be the best construction.

As heretofore stated, the two telescoping parts should fit one anothertightly. The

best means for securing this result is to make the internal diameter ofthe outside telescoping member slightly smaller than the externaldiameter of the inner member and to heat the outside member until it sofar expands that the inner member may be inserted. After beingtelescoped when in the proper condition the outside member upon beingallowed to cool will shrink and hug the inner member tightly.

When the two telescoping parts have been united substantially asdescribed-that is to say, so that one fits tightly within the othertheend thus formed is galvanized. As a preliminary to galvanizing the endwill be subjected to an acid-bath, which will clean the metal so thatthe zinc will adhere to all parts with which it can come in contact. Asthe result of the galvanizing process a thin coating of the zinc willadhere to the inner surface of the member A, to the walls of the holesin said member, and to such surface of the cap-flange as is exposedthrough the holes a. Thereby there are formed a plurality of thintubular retaining-studs which adhere to both of the parts, which theyassist in holding together, and they are integral parts of the coatingon the surface of the part having holes therein. These tubular studs areseparately weak, but their aggregate strength is quite sufficient toinsure against relative movement between these two parts of the tank. Bythis galvanizing process all the cracks are closed and a water-tightjoint obtained.

The drawings show only one end of the tank. The other end of the tankmay be in any suitable form. If the tank is to be a closed tank and theother end galvanized, in which case it may be exactly like the end B,the galvanizing material may be inserted through asuitable opening inthe body of the tank.

As shown in the drawings only the inner surface of the tank end isgalvanized. If the holes were in the outer telescoping member,

the outer surface would be galvanized. Ge-

nerically the exposed surface of that member in which the holes areformed is the surface which must be galvanized, and as it is beinggalvanized the walls of the holes and the surfaces of the other memberwhich are exposed through said holes will likewise be galvanized, withthe result of forming the hollow tubular studs, as described.

Having described my invention, I claim 1. A tank having two telescopingannular parts, one of the overlapping parts having a plurality of holestherein, and a thin coating of metal which adheres to the walls of saidholes, to the exposed surface of the part in which said holes areformed, and to so much of the surface of the other part as is exposedthrough said holes, substantially as and for the purpose specified.

2. A tank having a sheet-metal cylindrical body and a sheet-metal captherefor having a cylindrical flange which telescopes the end of saidbody, there being a series of holes through the innermost one of theseoverlapping members, combined with galvanizing on the inner surface ofthe tank which extends through said holes along the walls thereof andagainst the inner surface of the outer meni ber which'is exposed throughsaid holes, substantially as described.

3. The described process of making a tankjoint which consists intelescoping two parts of a tank one of said telescoping parts beingperforated, and in finally galvanizing said overlapping partssubstantially as described, whereby the zinc adheres to the Walls ofsaid perforations, to the exposed surface of the part through which saidperforations are formed, and to so much of the surface of the other partas is exposed through said perforations, substantially as and for thepurpose specified.

In testimony whereof I hereunto affix my signature in the presence oftwo witnesses.

WALLACE S. JUDD.

Witnesses:

ALBERT H. BATES, H. M. WISE.

